document.write( "Question 837564: A truck traveled the first 80 miles of a trip at one speed and the last 105 miles at an average speed of 5 miles per hour less. The entire trip took 5 hours. What was the average speed for the first part of the trip? \n" ); document.write( "
Algebra.Com's Answer #504648 by josgarithmetic(39620)\"\" \"About 
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Here will be shown help to start, but not the whole solution.\r
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\n" ); document.write( "\n" ); document.write( "Key idea is R*T=D, R for rate, T for time, D for distance.\r
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\n" ); document.write( "\n" ); document.write( "First 80 miles at the speed, r.
\n" ); document.write( "Last 105 miles at the speed r-5.\r
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\n" ); document.write( "\n" ); document.write( "_______________speed_________time_________distance
\n" ); document.write( "First___________r____________(____)________80
\n" ); document.write( "Last___________r-5___________(____)________105
\n" ); document.write( "TOTAL________________________5\r
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\n" ); document.write( "\n" ); document.write( "You need to fill the information for the two time quantities. You know that the equation , r*t=80, so you can solve this for t, and that gives the expression for the First time. You understand what to do for the \"Last\" time? \r
\n" ); document.write( "\n" ); document.write( "Can you continue and finish this?
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